Adjustable high chair



FIG. 1 is a perspective view of the adjustable high chair in its lowest position showing the design of our invention;

FIG. 2 is a perspective view of the adjustable high chair in its highest position thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a front view thereof.

The right side view is a mirror image of the left side view. 

The ornamental design for an adjustable high chair, as shown and described. 